---
title: ulp
framework: swift
role: symbol
role_heading: Instance Property
path: swift/float16/ulp
---

# ulp

The unit in the last place of this value.

## Declaration

```swift
var ulp: Float16 { get }
```

## Discussion

Discussion This is the unit of the least significant digit in this value’s significand. For most numbers x, this is the difference between x and the next greater (in magnitude) representable number. There are some edge cases to be aware of: If x is not a finite number, then x.ulp is NaN. If x is very small in magnitude, then x.ulp may be a subnormal number. If a type does not support subnormals, x.ulp may be rounded to zero. greatestFiniteMagnitude.ulp is a finite number, even though the next greater representable value is infinity. See also the ulpOfOne static property.